How to Use a Dash
https://www.thoughtco.com/what-is-a-dash-in-punctuation-1690416
May 30, 2019 · The en dash is so named because it is approximately the equivalent width of the uppercase letter N and the em dash is roughly the width of an uppercase M. Origins Merriam-Webster says the word dash comes from the Middle English word dasshen , which probably derives from the Middle French term dachier, meaning "to impel forward."
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